摘要
把焊接电弧作为一个发尘点源，应用大气湍流扩散理论，建立了焊接过程中烟尘扩散的数学模型．焊态下焊接烟尘在上升过程中逐渐成发散状态的喇叭口形，其烟尘浓度为一双正态分布函数．烟尘分布区域与湍流扩散系数Ｋ，距电弧发尘点源正上方的距离以及烟尘的上升速度有关．根据试验利用该数学模型计算出不同焊条的湍流扩散系数．结果表明，焊接过程中烟尘的湍流扩散系数比烟尘粒子的热扩散系数（分子扩散系数）大几个数量级．
A mathematical model of fume diffusion in welding process was founded by considering welding arc as a spot source of generating fume and supplying the turbulent diffusion theory. It showed that welding fume formed gradually a bell shaped diffusion when rising and the concentration of fume confirmed to be a double normal distribution function. The fume distribution region was related to the diffusion coefficient K of the turbulent, the distance from spot source and the arising velocity of fume. The coefficient of different electrodes in the experiment were calculated by using the above model. The study showed that turbulent diffusion coefficient is bigger up to severval orders than thermal diffusion coefficient (molecular diffusion coefficient).
出处
《武汉交通科技大学学报》
1997年第4期386-390,共5页
Journal of Wuhan University of Technology(Transportation Science & Engineering)
基金
国家自然科学基金
关键词
焊接
气溶胶
湍流扩散
数学模型
烟尘
welding aerosol
turbulent diffusion
mathematical model
